🔴 Mars as never seen before: landscapes that speak of the past!

Mars bears the mark of a turbulent geological history, shaped by violent impacts and intense volcanic activity. The recently published images by the European Space Agency allow us to travel into this distant past.

These photographs come from the Arabia Terra region, located in Mars's northern hemisphere. This area, over 3.7 billion years old, was captured by the Mars Express orbiter in October 2024. After extensive processing, these images now offer a colorful and detailed view of this ancient terrain, revealing structures patiently sculpted by time.


The Trouvelot crater, approximately 80 miles wide (about 130 km), dominates this Martian scene. Its softened rim and partially filled interior attest to its great age. Furthermore, numerous small craters dot its floor, indicating that meteoritic bombardment continued long after its initial formation.

Next to Trouvelot, another impact basin appears even older and more eroded, with contours almost erased. Trouvelot encroaches upon this degraded structure, confirming that it formed first. The floor of this basin is covered with dark rocks rich in minerals like magnesium and iron, resulting from past volcanic activity. These materials, redistributed by wind and gravity, are common throughout the region.


In the image, dark streaks and spots likely indicate volcanic deposits. Crescent-shaped dunes, called barchans, trace the direction of the Martian winds that continue to reshape the landscape. A bright mound about 12 miles long (about 20 km), streaked with ridges and grooves, might expose minerals altered in the presence of water. This shows how erosion and water played a role in the evolution of this territory.

The Mars Express probe, equipped with its high-resolution stereo camera, has been mapping Mars since 2003. The recent release of these images shows the value of reprocessing archived data. By improving the processing, scientists extract new details even from old observations.